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Finding the Fourth Proportional to 423.21, 634.37 and 217.56

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Solution

The fourth proportional to 423.21, 634.37 and 217.56 is: 326.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.21 : 634.37 = 217.56 : x
  2. Step 2: Convert to fraction form
    423.21/634.37 = 217.56/x
  3. Step 3: Cross multiply
    423.21x = 634.37 × 217.56
  4. Step 4: Simplify right side
    423.21x = 138,012.45
  5. Step 5: Solve for x
    x = 138,012.45/423.21
  6. Step 6: Final answer
    x = 326.11

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.